Empangan

Sistem takungan empangan merangkumi tiga kolam takungan iaitu Kolam Takungan Muda, Pedu dan Ahning. Empangan Muda dan Pedu dibina dalam tahun 1969 di bawah Skim Rancangan Pengairan Muda bertujuan untuk memberi air pengairan ke Kawasan Muda seluas 96,000 ha. bagi membolehkan tanaman padi dua kali setahun dijalankan. Manakala Empangan Ahning dibina pada tahun 1989 oleh Jabatan Kerja Raya dengan tujuan utama untuk pembekalan air domestik dan industri.

Pada tahun 1991 Empangan Ahning telah diserahkan kepada MADA bagi menjalankan kerja-kerja operasi dan penyenggaraan disebabkan oleh air dari Empangan Pedu dan Ahning akan mengalir ke satu saluran sungai hantaran yang sama untuk sampai ke ‘Pelubang Bifurcation’ di mana air akan diagihkan ke Wilayah I dan II melalui Terusan Utara dan ke Wilayah III dan IV melalui Terusan Tengah dan Selatan.

Memandangkan Empangan Muda mempunyai kawasan tadahan yang luas (984 km2) dan takungan yang rendah (160 juta m3) maka air dari Empangan Muda dialirkan ke Empangan Pedu yang m empunyai takungan yang tinggi (1073 juta m3) melalui Terowong Siong sepanjang 6.8 km untuk takungan dan perlepasan. Air untuk tujuan pengairan ke Kawasan Muda dilepaskan melalui Empangan Pedu dan Ahning.

Pengendalian dan penyenggaraan Empangan Pedu, Muda dan Ahning adalah di bawah seliaan Bahagian Pengurusan Empangan dan Sumber Air.

Empangan Pedu

1

Technical Data Of Pedu Dam

General
 Reservoir Storage 1073 x 106 m3
 Useful Drawdown 97.56 m to 67.07 m MSL
 Reservoir Area 52 sq. km
 Catchment Area 171 sq. km
Dam
 Type Rockfill with upstream asphaltic concrete membrane
 Foundation C’glomerate, quartzite, shale
 Maximum Height 61 metre
 Length At Top 220 metre
 Width Of Base 213 metre
 Upstream Slope 1 in 1.7
 Downstream Slope 1 in 1.5
 Description Asphaltic membrane 10 cm thick
Spillway
 Design Flood 280 m3 / sec at 100.15m MSL
 Description Overflow spill at Batang
 Length Of Crest 38.1 metre
 Crest Level 97.56 m MSL
Draw-Off
 Design draw-off 141.6 m3 / sec
 Through Pipes 2 x 2.6 m dia.
 Controlled By Hollow jet disc regulator with butterfly guard valves
Construction
 Excavation 80,000 m3
 Rockfill 700,000 m3
 Concrete 20,000 m3
 Reinforcement 1,000 tons

Empangan Muda

2

Technical Data Of Muda Dam

General
 Reservoir Storage 160 x 106 m3
 Useful Drawdown 100.6 m to 82.3 m MSL
 Reservoir Area 15.5 sq. km
 Catchment Area 984 sq. km
Dam
 Type Concrete ambursen buttress with overflow spillway
 Foundation Quartzite, mudstone
 Maximum Height 37 metre
 Length At Top 250 metre
 Width Of Base 55 metre
 Upstream Slope 1 in 1
 Downstream Slope 1.9 : 1
 Description
28 buttresses @ 6.7 m centres, 0.76 m to 1.07 m thick, facing slabs 0.6 m to 1.52 m thick
Spillway
 Design Flood 2,000 m3 / sec at 105.18 m MSL
 Description Spill-over dam
 Length Of Crest 93 metre
 Crest Level 100.6 m MSL
Draw-Off
 Design draw-off 45.3 m3 / sec
 Through Pipes 2 x 1.4 m dia.
 Controlled By Hollow jet disc regulator with butterfly guard valves
Construction
 Excavation 30,000 m3
 Concrete 46,000 m3
 Reinforcement 1,500 tons

Empangan Ahning

3

Tecchnical Data Of Ahning Dam

General
 Reservoir Storage 275 x 106 m3
 Useful Drawdown 113 m to 73 m MSL
 Reservoir Area 12 sq. km
 Catchment Area 122 sq. km
Dam
 Type Rockfill with concrete face
 Foundation
 Maximum Height 74 metre
 Length At Top 270 metre
 Width Of Base 188.5 metre
 Upstream Slope 1 in 1.3
 Downstream Slope 1 in 1.3
 Description
Upstream concrete face 300 mm thick
Spillway
 Design Flood 840 m3 / sec at 117 m MSL
 Description Ogee crest into Kah Ing. River
 Length Of Crest 52 metre
 Crest Level 113 m MSL
Draw-Off
 Design draw-off 2 x 6 m3 / sec
 Through Pipes 2 x 1.5 m dia.
 Controlled By Cone disc valve with butterfly guard valves
Construction
 Rockfill 770,000 m3

Saiong Tunnel – Intake & Outfall

5 4

Saiong Tunnel connects the Muda and Pedu Reservoirs, to permit water collected from Muda catchment to be transferred and stored in the Pedu Reservoir. It is a concrete-lined tunnel of “horseshoe” section 4.48 m high and 4.42 m wide, about 6.8 km long. Control gates are provided at both the Intake and Outfall ends of the tunnel and access to the tunnel can be made from both gate shafts.

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